Boon of the Magi

Epic Boon Feat (Prerequisite: Level 19+)

You gain the following benefits.

Ability Score Increase. Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 30.

When you cast a spell, you may roll a d20 for the fallowing results

1. you take the damage you would have delt

2-9. The spell fizzles and disappears

10-15. add another damage dice  

16-19. add 3d6 damage fallowing the spells damage 

20. you experience a moment of revelation, and you do max damagex2 and your roll results